Can't Save HS-WD200+ LED Action

[HappyGrux]

Hi. I can't save the action below. When I click on the save icon, the screen flickers momentarily, but it does not save.




Moments prior to encountering this problem, I was able to save a similar action in a different event to turn off LED #4 to all devices.

What am I missing here?

[HappyGrux]

Nevermind-- I figured it out (but can't figure out how to delete my post)! I had to make a selection in the Blink field.